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DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Apr.11, 1968, 849 O.G. 1221. Identification is by serial number of theapplication and the heading indicates the number of pages ofspecification, including claims and of sheets of drawing contained inthe application as originally filed. The file of this application isavailable to the public for inspection; reproduction may be purchasedfor 30 cents per sheet.

T Applications published under the Defensive Publication Program havenot been examined as to the merits 01' alleged invention. The PatentOflice makes no assertion as to the novelty of the disclosed subjectmatter.

PUBLISHED APRIL 29, 1969 PHOTOELECTRIC SCANNER FOR DETECTING RIDGES ANDINDENTATIONS IN A YARN PACKAGE Gerald Irving Buckson, Newark, and JohnAlbert Masino and Stanley Victor Williams, Wilmington, Del., assignorsto E. I. du Pont de Nemours and Company, Wilmington Del., a corporationof Delaware Filed Feb. 1, 1968. Published Apr. 29, 1969 Int. Cl. G01n21/30; H01j 39/12; G01b 11/30 US. Cl. 250-219 1 Sheet Drawing. 10 PagesSpecification An apparatus for simultaneously measuring ridges andindentations in the peripheral surface of a rotating cylindrical yarnpackage wherein a ribbon of light is projected axially across thesurface of the package at an angle With respect to the longitudinal axisof the package to cast shadows corresponding to the ridges andindentations. The illuminated portion of the package surface is scannedin a non-specular plane and the light reflected from the package surfacein the non-specular plane is redirected to a photosensitive means whichdetects ridges and indentations in the surface of the package throughvariations in intensity of the redirected light.

*3 (A April 1969 G. BUCKSON ET AL DEF. PUB.

PHOTOELECTRIC SCANNER FOR DETECTING RIDGES AND INDENTATIONS IN A YARNPACKAGE Filed Feb. 1, 1968 FIG-l 1e DETECTOFTL @L i 2 12.), 1 4 a g 66DISCRIMlNATOR MEMORY mTERRoGATOR 58 I 80 DEVICE DETECTOR 7 H' FIELD orVIEW F l G. 2;

4 NE F foams u FIELDO VIEW INVENTORS GERALD IRVING BUCKSON JOHN ALBERTMASINO STANLEY VICTOR WILLIAMS ATTORNEY

